Kristen Stewart: Happy 20th Birthday!

Today she turns 20 years old and Kristen Stewart is on top of the world with a successful career and a hunky boyfriend with whom to share her amazing life.

The “New Moon” babe is said to be celebrating her big day with costar/main squeeze Robert Pattinson, who is said to have some surprises up his sleeve.

According to a source, Robert is taking a break from filming “Bel Ami” in Budapest, Hungary to show his gal some love.

“Rob has told friends he plans to make Kristen’s 20th birthday extra special. He says he has a special surprise lined up that has set him back a few thousand dollars. But he won’t say what it is! He’s also spoken with Kristen’s parents about arranging a surprise party.”